#include<stdio.h>
 int main()
 {
 	double a,b,c,s;
 	printf("please input a:");
 	scanf("%lf",&a);
 	printf("please input b:");
 	scanf("%lf",&b);
 	printf("please input c:");
 	scanf("%lf",&c);
 	if(a+b<=c)
	 printf("there is no result");
 	else if(a+b<=c)
 	printf("there is no resule");
 	else if(b+c<=a) 
 	printf("there is no resule");
 	else 
 	s=a+b+c;
 	printf("the Perimeter is:%lf",s);
 	return 0;
 	
 	
 }
